UnratedFix available
mm/mempolicy: fix mpol_new leak in shared_policy_replace
Type: advisorySources: OSV
In the Linux kernel, the following vulnerability has been resolved: mm/mempolicy: fix mpol_new leak in shared_policy_replace If mpol_new is allocated but not used in restart loop, mpol_new will be freed via mpol_put before returning to the caller. But refcnt is not initialized yet, so mpol_put could not do the right things and might leak the unused mpol_new. This would happen if mempolicy was updated on the shared shmem file while the sp->lock has been dropped during the memory allocation. This issue could be triggered easily with the below code snippet if there are many processes doing the below work at the same time: shmid = shmget((key_t)5566, 1024 * PAGE_SIZE, 0666|IPC_CREAT); shm = shmat(shmid, 0, 0); loop many times { mbind(shm, 1024 * PAGE_SIZE, MPOL_LOCAL, mask, maxnode, 0); mbind(shm + 128 * PAGE_SIZE, 128 * PAGE_SIZE, MPOL_DEFAULT, mask, maxnode, 0); }
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 4.14.276, 4.19.238, 4.9.311, 5.10.111, 5.15.34, 5.16.20, 5.17.3, 5.4.189
- CVEs
- CVE-2022-49080
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 11:50 UTC · Revision 1
Source evidence
mm/mempolicy: fix mpol_new leak in shared_policy_replace
core-osv · Original sourcePublished 26 Feb 2025, 01:54 UTC
In the Linux kernel, the following vulnerability has been resolved: mm/mempolicy: fix mpol_new leak in shared_policy_replace If mpol_new is allocated but not used in restart loop, mpol_new will be freed via mpol_put before returning to the caller. But refcnt is not initialized yet, so mpol_put could not do the right things and might leak the unused mpol_new. This would happen if mempolicy was updated on the shared shmem file while the sp->lock has been dropped during the memory allocation. This issue could be triggered easily with the below code snippet if there are many processes doing the below work at the same time: shmid = shmget((key_t)5566, 1024 * PAGE_SIZE, 0666|IPC_CREAT); shm = shmat(shmid, 0, 0); loop many times { mbind(shm, 1024 * PAGE_SIZE, MPOL_LOCAL, mask, maxnode, 0); mbind(shm + 128 * PAGE_SIZE, 128 * PAGE_SIZE, MPOL_DEFAULT, mask, maxnode, 0); }
osv:CVE-2022-49080
Kernel
Fixed versions: 4.9.311, 4.14.276, 4.19.238, 5.4.189, 5.10.111, 5.15.34, 5.16.20, 5.17.3
Complete source record
{
"id": "4718f9d935e68e032d6db30fbf1f1b9e2fd81df0787c34ff471a56eabe55cc09",
"url": "https://osv.dev/vulnerability/CVE-2022-49080",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "mm/mempolicy: fix mpol_new leak in shared_policy_replace",
"summary": "In the Linux kernel, the following vulnerability has been resolved: mm/mempolicy: fix mpol_new leak in shared_policy_replace If mpol_new is allocated but not used in restart loop, mpol_new will be freed via mpol_put before returning to the caller. But refcnt is not initialized yet, so mpol_put could not do the right things and might leak the unused mpol_new. This would happen if mempolicy was updated on the shared shmem file while the sp->lock has been dropped during the memory allocation. This issue could be triggered easily with the below code snippet if there are many processes doing the below work at the same time: shmid = shmget((key_t)5566, 1024 * PAGE_SIZE, 0666|IPC_CREAT); shm = shmat(shmid, 0, 0); loop many times { mbind(shm, 1024 * PAGE_SIZE, MPOL_LOCAL, mask, maxnode, 0); mbind(shm + 128 * PAGE_SIZE, 128 * PAGE_SIZE, MPOL_DEFAULT, mask, maxnode, 0); }",
"evidence": "osv:CVE-2022-49080",
"products": [
{
"name": {
"value": "Kernel",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.9.311",
"evidence": "/affected/1/ranges"
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{
"value": "4.14.276",
"evidence": "/affected/1/ranges"
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"evidence": "/affected/1/ranges"
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{
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"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CVE-2022-49080",
"aliases": [
"CVE-2022-49080"
],
"affected": [
{
"ranges": [
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
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{
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{
"fixed": "4ad099559b00ac01c3726e5c95dc3108ef47d03e"
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],
"modified": "2026-10-28T02:30:34.933706556Z",
"provider": "osv",
"references": [
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"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49080.json",
"https://nvd.nist.gov/vuln/detail/CVE-2022-49080",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
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},
"related_cves": [
{
"value": "CVE-2022-49080",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 502178,
"published_at": "2025-02-26T01:54:41.176+00:00"
}